Applied anatomy of anterior and dorsal root nerve tracts in the improved high selective dorsal rhizotomy
- VernacularTitle:改良高选择性脊神经后根部分切断术中前后根神经分束的应用解剖
- Author:
Xifan MEI
;
Wei WANG
;
Shujian QIN
;
Ping ZHANG
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2005;9(29):178-180
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Anterior and dorsal root nerve tracts should be separated to small tracts in high selective dorsal rhizotomy, because detailed tract separation will benefit electrostimulation, thereby helping correctly cutting the lower-threshold Ia nerve fibers that cause convulsion, and meanwhile sensory nerve fibers in dorsal nerve root can be reserved as many as possible.OBJECTIVE: To meet the needs of limited and high selective spinal dorsal rhizotomy, anterior and dorsal root of spinal nerve were microanatomized to be certain of the separation standard and the number of small nerve tracts, so as to provide reliable basis and novel operative standard for clinical operation.DESIGN: Single sample experiment with adult corpses as subjects.SETTING: Orthopedic Department of the First Affiliated Hospital and Department of Anatomy, Jinzhou Medical College.PARTICIPANTS: This study was carried out at the Anatomical Laboratory of Jinzhou Medical College in December 1999. Fifteen adult corpses, 11 males and 4 males, were donated, and the donators signed informed consent when alive.tained from the 15 adult spinal cords (30 sides) and subjected to morphoanterior and dorsal roots of L5 spinal cord were obtained from a fresh corpse for immunohistochemical staining. The starting part, middle part and the exterior of intervertebral foremen was cut into slices, and the total number of nerve fibers, the number of Ia nerve fibers responsible for convulsion, and their percentage in the total fibers were counted. Meanwhile the distribution and the number of Ia nerve fibers in the three parts were compared.ber of nerve fibers per 100 μm2, the percentage of Ia nerve fibers in the total nerve fibers at the starting part, middle part and exterior of intervertebral foremen of spinal nerve dorsal root.root filaments. Microsurgical observation proved that dorsal root could be divided into 10-18 small tracts and anterior root 6-11 tracts; the diameter number of nerve fibers in the three parts of spinal nerve dorsal root was (3 243±143) fibers per 100 μm2, including (1 702±85) Ia nerve fibers that constituted about 52.5% of the total nerve fibers. Ia nerve fibers were found to be evenly distributed in dorsal root and no gathering could be observed.CONCLUSION: The tracts in anterior and dorsal roots of spinal cord should be separated as minutely as possible during improved dorsal rhizotomy, which is beneficial for cutting off Ia nerve fibers correctly. Generally,the anterior root consists of 6-11 small tracts and dorsal roots of 10-18small tracts, and nerve tracts should not be cut off over 1/2 of total dorsal nerve fibers.
